Helmet Space with Air Intakes and Hole on Top

Technic Link Tread Wide with Two Pin Holes, Reinforced Plate Round 1 x 1 with Solid Stud Technic Pin with Friction Ridges Lengthwise and Center Slots Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Tile 1 x 2 with Groove Technic Axle 2 Notched Technic Bush Technic Axle 5.5 with Stop [Rounded Short End] Brick 2 x 2 Technic Pin without Friction Ridges Lengthwise Brick Round 2 x 2 with Axle Hole Tile Special 2 x 2 Corner with Cut Corner - Facet